Do I need to use destructor here?

[Pushkar Pradhan]

I have a function which holds a list of my data structure PARTICLE,
initially the list is declared empty, but I grow it in this function.
Now my question is do I have to write a destructor (since the datatype
is my own) to delete the list?
Or does it get deleted automatically once the function exits?
Code:

compute_hull(....)
{
list<PARTICLE> hull2;

for(i = 0; i < X; i++) {
/* depending on some condition */
hull2.push_back(...);
}

/* is destructor reqd. for hull2 now? */
}

Thanks,
Pushkar Pradhan

[Gianni Mariani]

Pushkar Pradhan wrote:

I have a function which holds a list of my data structure PARTICLE,
initially the list is declared empty, but I grow it in this function.
Now my question is do I have to write a destructor (since the datatype
is my own) to delete the list?
Or does it get deleted automatically once the function exits?
Code:

compute_hull(....)
{
list<PARTICLE> hull2;

for(i = 0; i < X; i++) {
/* depending on some condition */
hull2.push_back(...);
}

/* is destructor reqd. for hull2 now? */
}

hull2 is a variable. list<> has a destructor that will delete all the
"PARTICLE" objects. I have no idea if PARTICLE requires a destructor.

G

[Pushkar Pradhan]

Gianni Mariani wrote:

Pushkar Pradhan wrote:

I have a function which holds a list of my data structure PARTICLE,
initially the list is declared empty, but I grow it in this function.
Now my question is do I have to write a destructor (since the datatype
is my own) to delete the list?
Or does it get deleted automatically once the function exits?
Code:

compute_hull(....)
{
list<PARTICLE> hull2;

for(i = 0; i < X; i++) {
/* depending on some condition */
hull2.push_back(...);
}

/* is destructor reqd. for hull2 now? */
}

hull2 is a variable. list<> has a destructor that will delete all the
"PARTICLE" objects. I have no idea if PARTICLE requires a destructor.

G

I tried doing a "~hull2()", but the compiler gives syntax error, does
that help?

[Gianni Mariani]

Pushkar Pradhan wrote:

Gianni Mariani wrote:

Pushkar Pradhan wrote:

I have a function which holds a list of my data structure PARTICLE,
initially the list is declared empty, but I grow it in this function.
Now my question is do I have to write a destructor (since the
datatype is my own) to delete the list?
Or does it get deleted automatically once the function exits?
Code:

compute_hull(....)
{
list<PARTICLE> hull2;

for(i = 0; i < X; i++) {
/* depending on some condition */
hull2.push_back(...);
}

/* is destructor reqd. for hull2 now? */
}

hull2 is a variable. list<> has a destructor that will delete all the
"PARTICLE" objects. I have no idea if PARTICLE requires a destructor.

G

I tried doing a "~hull2()", but the compiler gives syntax error, does
that help?

The destructor call would be: hull2.~list<PARTICLE> but this would be
*really bad* to call because it's automagically called for you when you
return (or take an exception and the stack is rolled back past a
compute_hull stack frame).

Rule - don't go calling destructors unless you're doing your own memory
management (i.e. writing your own container). Use the language
semantics to do this for you.